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I'm designing a circuit that supplies power via USB to an Arudino. The USB power runs through a 3v3/5v dual regulator. I'd like to use a small tactile switch in front of the IN lead on the regulator as an interrupt/reset apparatus, but I'm finding it difficult to obtain a suitable NC switch, though I have a variety of suitable NO switches on hand.

How reasonable is it to close the switch to ground as a means of interrupting power to the rest of the circuit? As an example:

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My assumption is that the resistance of the regulator and everything past it will make the closed-to-ground path better and should interrupt the power. But I've never used an NO switch in this fashion and wanted to make sure I wasn't missing anything.

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  • \$\begingroup\$ What regulator are you using? \$\endgroup\$ – Andy aka Mar 1 at 16:00
  • \$\begingroup\$ MIC5211 - ww1.microchip.com/downloads/en/DeviceDoc/mic5211.pdf \$\endgroup\$ – Jesse Williams Mar 1 at 16:09
  • \$\begingroup\$ Eh, specifically the MIC5211-LXYM6-TR \$\endgroup\$ – Jesse Williams Mar 1 at 16:09
  • \$\begingroup\$ Why don't you use the enable pins of that device for turning power off with the push button? \$\endgroup\$ – Andy aka Mar 1 at 16:13
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    \$\begingroup\$ I could, but I'm not sure it's effectively different since I just have IN hardwired to ENA and ENB. It would still just have to interrupt to ground, even if I placed it between IN and ENA/ENB. \$\endgroup\$ – Jesse Williams Mar 1 at 16:24

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